I bought my Audi with a known problem in that when the diesel level gets to between half and quarter it will stop. This is due to a pump problem in the tank not pumping diesel from one side to the other?
I understand that the TDi has a high pressure belt driven pump on the engine and there is a pump in the tank.
is there just one pump in the tank? and is its purpose move diesel from one side to then other?

any suggestions welcome

Thank you

regards

Malcolm